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We studied the dynamics of the so-called $\theta$-term, which exists in topological materials and is related to a hypothetical field predicted by Peccei-Quinn in particle physics, in a magnetic superlattice constructed using a topological…

Mesoscale and Nanoscale Physics · Physics 2018-06-13 Katsuhisa Taguchi , Tatsushi Imaeda , Tetsuya Hajiri , Takuya Shiraishi , Yukio Tanaka , Naoya Kitajima , Tatsuhiro Naka

When tiny soft ferromagnetic particles are placed along a liquid interface and exposed to a vertical magnetic field, the balance between capillary attraction and magnetic repulsion leads to self-organization into well-defined patterns.…

Soft Condensed Matter · Physics 2020-11-13 Ylona Collard , Galien Grosjean , Nicolas Vandewalle

We propose and design a new type of nonlinear metamaterials exhibiting a resonant electric response at microwave frequencies. By introducing a varactor diode as a nonlinear element within each resonator, we are able to shift the frequency…

Optics · Physics 2009-08-25 David A. Powell , Ilya V. Shadrivov , Yuri S. Kivshar

We show the presence of an electromagnetic field can cause a gravitational Meissner effect and, as a result, a gravitational shielding. With this aim in view we must first unveil the following problems : generalized Maxwell equations,…

General Physics · Physics 2007-05-23 M. Agop , C. Gh. Buzea , B. Ciobanu

The interplay between long-range and local Coulomb repulsion in strongly interacting electron systems is explored through a two-dimensional Hubbard-Wigner model. An unconventional metallic state is found in which collective low-energy…

Strongly Correlated Electrons · Physics 2009-10-23 S. Fratini , J. Merino

The ground state properties of a paramagnetic Mott insulator are investigated in the presence of an external electrical field using the inhomogeneous Gutzwiller approximation for a single band Hubbard model in a slab geometry. The metal…

Strongly Correlated Electrons · Physics 2015-05-30 D. Nasr Esfahani , L. Covaci , F. M. Peeters

Repulsive and attractive forces are both possible between a superconducting sample and a permanent magnet, and they can give place to magnetic levitation or free-suspension phenomena, respectively. We show experiments to quantify this…

Superconductivity · Physics 2009-10-31 S. O. Valenzuela , G. A. Jorge , E. Rodriguez

Laser has become a powerful tool to manipulate micro-particles and atoms by radiation pressure force or photophoretic force, but optical manipulation is less noticeable for large objects. Optically-induced negative forces have been proposed…

Optics · Physics 2020-08-11 Gui-hua Chen , Mu-ying Wu , Yong-qing Li

It is shown that the gravity acceleration just above a chamber filled with gas or plasma at ultra-low pressure can be strongly reduced by applying an Extra Low-Frequency (ELF) electromagnetic field across the gas or the plasma. This…

General Physics · Physics 2013-12-03 Fran De Aquino

We discuss the Lorentz model for dispersion and absorption of radiation in dilute, linear and isotropic materials. Initially, with the purpose of making the paper as self-contained as possible, we reproduce the usual calculations concerning…

Classical Physics · Physics 2009-01-15 T. N. C. Mendes , Reinaldo de Melo e Souza , C. Farina

We analyze nonlinear properties of microstructured materials with negative refraction, the so-called left-handed metamaterials. We demonstrate that the hysteresis-type dependence of the magnetic permeability on the field intensity allows…

The question of how a metal becoming superconducting expels a magnetic field is addressed. It is argued that the conventional theory of superconductivity has not answered this question despite its obvious importance. We argue that the…

Superconductivity · Physics 2016-02-02 J. E. Hirsch

We demonstrate that two-dimensional chiral superconductors on curved surfaces spontaneously develop magnetic flux. This geometric Meissner effect provides an unequivocal signature of chiral super- conductivity, which could be observed in…

Superconductivity · Physics 2018-06-06 T. Kvorning , T. H. Hansson , A. Quelle , C. Morais Smith

Strongly anisotropic media where the principal components of electric permittivity or magnetic permeability tensors have opposite signs are termed as hyperbolic media. Such media support propagating electromagnetic waves with extremely…

We consider a superconducting material that exists in the liquid state, more precisely, in which the Meissner-Ochsenfeld effect persists in the liquid state. First, we investigate how the shape of such a hypothetical Meissner liquid will…

Superconductivity · Physics 2008-03-06 A. Maeyens , J. Tempere

The coherent interaction between free electrons and optical fields can produce free-electron compression and push the temporal resolution of ultrafast electron microscopy to the attosecond regime. However, a large electron-light interaction…

Quantum Physics · Physics 2025-03-27 Cruz I. Velasco , F. Javier García de Abajo

A reexamination of the Clausius-Mossotti relation in which material with both electric and magnetic responses yields surprising results. Materials with indices near zero and with real parts less than zero, that is the real part of both the…

Optics · Physics 2023-08-29 Lang Wang , Ilia L. Rasskazov , P. Scott Carney

Understanding and manipulation of the laser processing quality during the ablation of solids have crucial importance from fundamental and industrial perspectives. Here we have studied the effect of external magnetic field on the…

We combine Maxwell's equations with Eulers's equation, related to a velocity field of an immaterial fluid, where the density of mass is replaced by a charge density. We come out with a differential system able to describe a relevant…

General Physics · Physics 2009-11-26 Daniele Funaro

Metamaterials-or artificial electromagnetic materials-can create media with properties unattainable in nature, but mitigating dissipation is a key challenge for their further development. Here, we demonstrate a low-loss metamaterial by…

Optics · Physics 2014-06-02 Aditya Jain , Philippe Tassin , Thomas Koschny , Costas M. Soukoulis